Hydraulic pressure control valve for automobile brake mechanism

Abstract

A hydraulic pressure control valve for an automobile brake mechanism which is provided with a first hydraulic pressure passage communicating with each brake units of, for instance, front wheels, and a second hydraulic pressure passage communicating with each brake units of, for example, rear wheels, and in which a plunger 5 is disposed in at least one or both of the hydraulic pressure passages and at least one hydraulic pressure regulating mechanism for converting the hydraulic pressure of a brake liquid as desire for instance, a poppet valve 14, is provided in association with the plunger in the hydraulic pressure passage having disposed therein the plunger, and in which blocking member is provided for inhibiting the plunger 5 from moving in a direction in which to cut off the brake liquid when the hydraulic pressure of either one of the hydraulic pressure passages fails. The blocking member is composed of a moving member 10 moved by a difference in pressure between the both hydraulic pressure passages and a pressurizing member 17 for generating a pressure on the plunger by the movement of the moving member.

We claim: 
     
       1. A hydraulic pressure control valve for an automobile brake mechanism having a first hydraulic pressure passage communicating with each brake unit of one of front and rear wheels of the automobile, a second hydraulic pressure passage communicating with each brake unit of the other of said front and rear wheels, a plunger disposed in at least one of the hydraulic pressure passages and at least one hydraulic pressure regulating mechanism provided in association with the plunger, characterized in that said valve comprises: a moving member moved by a difference in pressure between the first and second hydraulic pressure passages, said moving member being formed as a cylindrical member, and having an inner peripheral surface, said inner peripheral surface having a first portion conforming to the outer peripheral surface of the plunger with a small gap defined therebetween and said inner peripheral surface having a second portion separated from said first portion by a shoulder, said shoulder defining a pressurizing surface on said inner peripheral surface of the moving member;   a pressurizing member compressed by the movement of the moving member to apply pressure to the plunger;   and a stopper member for supporting the pressurizing member between the stopper member and the pressurizing surface of said moving member;   said pressurizing member being formed of an elastic material, so that when compressed by said stopper member and the pressurizing surface of said moving member, said pressure member exerts a large radial force on the plunger, thereby inhibiting the movement of the plunger.   
     
     
       2. A hydraulic pressure control valve for an automobile brake mechanism according to claim 1, characterized in that the pressurizing member is a circular member conforming to the outer peripheral surface of the plunger with a small gap defined therebetween. 
     
     
       3. A hydraulic pressure control valve for an automobile brake mechanism according to claim 1, wherein said valve is composed of a pair of moving members moved by a difference pressure between the first and second hydraulic pressure passages and disposed adjacent each other, a pressurizing member pressed by the movement of the moving members to apply a pressure to the plunger, and a stopper member for supporting the pressurizing member. 
     
     
       4. A hydraulic pressure control valve for an automobile brake mechanism according to claim 3, characterized in that at least one of the pair of moving members has a pressurizing surface for holding the pressurizing member between it and the stopper member. 
     
     
       5. A hydraulic pressure control valve for an automobile brake mechanism according to claim 3, characterized in that the pressurizing member is provided with a pressurizing portion adjacent one end of the plunger. 
     
     
       6. A hydraulic pressure control valve for an automobile brake mechanism according to claim 3, characterized in that the stopper member is fixed by a pin to a valve proper. 
     
     
       7. A hydraulic valve according to claim 3 wherein the pressurizing member is provided with a pressurizing portion opposite one end of the plunger.